Hydrogenation of gluconolactones in equilibrium with gluconic acid on ruthenium catalyst |
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Authors: | Lionel Fabre Guy Flèche Patrick Fuertes Pierre Gallezot Alain Perrard |
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Affiliation: | (1) Institut de Recherches sur la Catalyse–CNRS, 69626 Villeurbanne Cedex, France;(2) Société Roquette Frères, 62136 Lestrem, France |
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Abstract: | Water solutions of glucono-δ-lactone and glucono-γ-lactone in equilibrium with gluconic acid were hydrogenated with molecular
hydrogen in the presence of a commercial carbon-supported ruthenium catalyst (5% Ru/C, Engelhard Escat 40). Reactions were
conducted batchwise on 20 wt% solutions under 100 bar pressure in the temperature range 80–140°C. Reaction rates were unexpectedly
high at moderate temperatures (e.g., 0.58 mol h-1 g
Ru
-1
at 100°C) because lactones were probably the reactive species. The selectivity to sorbitol at total conversion was larger
than 99% at temperatures lower than 100°C. Kinetic study was done at different temperatures, pressures and concentrations.
Modelling of the reaction kinetics showed that the reaction followed a rate law corresponding either to the Langmuir–Hinshelwood
mechanism without H2 dissociation, or to the Horiuti–Polanyi mechanism.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | ruthenium catalyst gluconic acid gluconolactones carbohydrate hydrogenation sorbitol |
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